Coke oven



Feb. 7, 1961 E. THOMPSON, JR

COKE OVEN 4 Sheets-Sheet 2 Filed Jan. 12, 1959 INVENTOR ERNEST THOMPSONLJR.

ATTORNEY Feb. 7, 1961 E. THOMPSON, JR

COKE OVEN 4 Sheets-Sheet 3 Filed Jan. 12, 1959 FIG.3.

INVENTOR ERNES'L THOM PSONJR.

ATTORNEY COKE OVEN Ernest Thompson, Jr., Darien, Conn., assignor to Allied Chemical Corporation, New York, N.Y., a corporation of New York Filed Jan. 12, 1959, Ser. No. 786,163

6 Claims. (Cl. 202-151) balanced heating of the oven structure.

One problem heretofore encountered in the operation of a coke plant or battery has been the loss of heat from the ends of the ovens due to radiation from the end heating flues. Such heat loss results in the brickwork at the ends of the ovens becoming cooler than that at the intermediate portions which may cause cracking and resulting leakage of the brickwork and serious damage to the ovens in addition to nonuniform coking temperatures throughout the length of the ovens. This problem of heat radiation loss with attendant cracking of brickwork and damage to the ovens is particularly serious during slowdown or reduced rate operation of the battery. The ovens are considerably less intensely heated during the slowdown or reduced rate operation, a typical coking time being about four times longer per charge than during normal operation, and .hence it is considerably more diflicult to maintain the temperature of the oven brickwork in the locality of the end flues above the minimum temperature, approximately 1600 F.

in the case of silica brick, at which contraction takes place.

It is an object of this invention to provide for relatively balanced heating of coke ovens during slowdown United States Patent F or reduced rate coking operations occurring during slack times, etc., to prevent cracking of the oven brickwork and attendant serious damage to the ovens.

Another object is to provide coke ovens in which supply or flow of fuel gas is controlled to end and intermediate heating flues of the ovens to provide relatively balanced heating of the oven structure.

A further object is to provide coke ovens in which supply or flow of fuel gas is controlled to end and intermediate heating flues of the ovens to provide for heating of end heating flues to a greater extent than intermediate heating flues to compensate for loss of heat by radiation from the end flues.

Other objects and advantages will be apparent as the invention is hereinafter described in more detail.

The coke ovens which are improved by the instant invention are of the well-known type comprising horizon tal coking chambers and interposed heating walls each formed with a row of vertical flues, and in which horizontal fuel gas supply channels or conduits are located beneath the vertical flues, and communicate with the latter through vertical ducts having their inlets spaced along the length of the conduits. The heating walls are supported by pillar walls between which are regenerator chambers, the regenerator chambers alternately supplying preheated air to and receiving combustion product from the vertical heating flues. There are usually about 29 heating flues in each heating wall, each heating wall being ordinarily about 40 feet long. Fuel gasis supplied to the'horizontal supply conduits from the fuel gas main which extends the full length of the battery. Such ovens are disclosed in US. Patent 1,528,808 of March 10, 1925.

In accordance with the invention, a fuel gas flow con trol insert is arranged for movement within the horizontal fuel gas supply conduit of a horizontal coke oven for controlling flow of fuel gas to the end and inner or intermediate vertical heating flues. The fuel gas flow control insert comprises a horizontal member of substantial length and of a width approximately that of the gas supply conduit extending across and dividing a portion of the horizontal gas supply conduit into upper and lower passageways each of substantial length, a bafiie adapted to project downwardly from an outer end portion of the horizontal member and extend transversely to and partially obstruct the lower passageway and another bafile which is imperforate projecting upwardly from the opposite inner end portion thereof and extending transversely to and obstructing the upper passageway. Such flow control insert is longitudinally movable within the supply conduit into and out of a position wherein its upwardly projecting bafile is intermediate the inlet for the duct for an end heating flue and the inlet for the duct for an adjacent inner or intermediate flue, and its other bafile is located inwardly of the fuel gas inlet whereby flow of fuel gas is controlled or regulated to the end and inner heating flues. When the last-mentioned baffle projects downwardly from the horizontal member and extends transversely to and partially obstructs the lower passageway, flow of fuel gas is decreased or inhibited to inner heating flues and concomitantly increased to the end heating fine to provide for heating of the end fine to a greater extent than the inner or intermediate flues to compensate for loss of heat by radiation from the end flue. f

In one embodiment of the invention, the baffle mounted or located at the outer end of the horizontal member constantly projects downwardly therefrom, is immovable, and formed with an orifice, the orifice having a smaller cross-sectional area than that of the lower passageway for throttling or inhibiting flow of fuel gas to the inner or intermediate heating flues resulting in increased fuel gas flow to the end flue or flues. In another embodiment, the bafile at the outer end of the horizontal member is imperforate, i.e. does not have an orifice or opening, and is shaped and arranged for movement into and out of predetermined positions wherein it: extends transversely to portions of both the upper and lower passageways to modify the relative cross sectional areas of such passageways and obstruct flow of fuel gas through the passageways. Proportions of fuel gas flowing through the upper and lower passageways en route to the end and inner heating flues can be readily varied by use of the movable baflle of the fuel gas flow control insert.

In the drawings:

Fig. l is a fragmentary vertical section through a heating wall and fuel gas supply conduit of a coke oven battery embodying the improvement of the present invention.

Fig. 2 is a longitudinal vertical section through a heating wall and fuel gas supply conduit of a coke oven battery embodying a preferred improvement of this invention.

Fig. 3 is a transverse composite fragmentary vertical section through a coke oven battery of this invention, the left hand portion being taken in a plane passing through the fuel gas supply conduit beneath the vertical .heating flues in the locality of a gas nozzle looking in 3 looking in the direction of the downwardly projecting outer orifice baifles of thefuel gas flow control inserts.

Pig. 4 is asection taken on line 4-4 of Fig. 1.

:Fig. 5 is asection taken on line 5-5 of Fig. '1.

Fig. '6 is an enlarged longitudinal section through a fuel gas flow control insert of the present invention.

lfi'g. 7 is a top plan view of the insert of Fig. 6.

Fig. 8 is a fragmentary vertical section through a horizontal fuel gas supply conduit in the lower portion of a coke oven embodying the improvement of this invention.

' Fig. 9 is a section on line 95-9 of Fig. 8.

Fig. 10 is a section on line 10- -10 of Fig. 8.

T Referring to Fig. 1 of the drawings, heating wall 15, which is arranged along one side of a coking chamber, is formed with vertical fines including endmost flue 16 an'd inner or intermediate flues 17 and 18. Vertical fines 16, 17 and 18 communicate with horizontal fuel gas supply channel or conduit 19, formed in the masonry of the oven structure, by vertical ducts 20, 21 and 22 respectively having inlets 23, 24 and 25 respectively in 'conduit 19. As shown, refractory gas proportioning nozzles 26, 27 and 28 are inserted in the lower portion of the vertical ducts in the region of the duct inlets. Fuel gas inlet 30 for supply conduit 19 is intermediate an outer end 31 thereof and endmost flue 16, inlet 30 communicating with fuel gas main 32 through pipe 33, flexible conduit 34, and pipes 35, 36 and -37 respectively. Gas supply conduit 19 extends outwardly of the oven and connects to metallic gas supply pipe or gun 38. As shown, the outer end portion of gas supply conduit 19 beneath endmost flue 16 is lined with metallic pipe 40 for preventing leakage of fuel gas in this area. Preheated air is supplied to heating fines 16, 17 and 18 for combustion purposes from the regenerator through ducts or ports 41, 42 and 43 respectively. Fuel gas flow "control insert 44 preferably of metal, e.g. stainless steel, is longitudinally movable within fuel gas supply conduit 19 for controlling flow of fuel gas to the heating flues.

Gas flow control insert 44 is placed or inserted within conduit 19 through openings 45 and 46 in the battery buckstay 59 and has gun 38 respectively. Opening 45 in the oven buckstay is provided by moving swinging cover 47 upwardly from its broken outline position 48, and opening 46 in the gas gun end is provided by moving swinging cover 49 downwardly from its broken outline portion 49a.

Flow control insert 44 comprises horizontal elongated rectangular plate 50 having width approximating that of conduit 19 extending across anddividing a portion of conduit 19 into upper and lower elongated passageways 51 and 52 respectively. Horizontal plate 50 has typical length of 18 inches. As shown, horizontal plate 50 is at a level of conduit 19 above its mid-level. However, plate 50 could extend'across conduit 19 at its mid-level or at a level below its mid-level. Width of plate 50 would of course approximate or be similar to the width or diameter of conduit 19 at the particular or desired level of conduit 19 wherein plate 50 is located. As shown in more detail in Figs. 4 7, plate 53 having an arcuate periphery and size similar to that of lower "passageway 52, of substantially uniform thickness and .for-med with orifice 54 of smaller cross-sectional area than that of lower passageway 52, projects downwardly from one end of horizontal plate 50 integral therewith and obstructs lower passageway 52. Orifice 54 has typical diameter of inch. Plate 55 of substantially uniform thickness and imperforate, i.e. not formed with an orifice or opening projects upwardly and inwardly from the opposite end of horizontal plate 50 'integral therewith and obstructs and terminates upper passageway 51. Plate 55 of parabolic shape preferably projects inwardly of the oven as well as upwardly from horizontal plate 50 to insure that flow of fuel gas upwardly from the inner end of lower passageway 52 to the upper portion of supply conduit 19 will be gradual and its direction of flow not changed too abruptly or suddenly, to insure that substantial quantities of gas intended for combustion in adjacent heating flue 17 do not flow by its duct inlet 24 without entering the duct for passage to this flue.

Insert 44 is mounted or supported on elongated paralled bars 56 and 57, preferably of metal, e.g. steel, each bar being affixed to an opposed inner side wall of supply conduit 19 (lined with metallic pipe 40) by any suitable means, e.g. welding, and each projecting outwardly a small or limited distance therefrom. Insert horizontal plate 50 is longitudinally slidable on top surfaces of parallel bars 56 and 57. Bars 56 and 57 in addition to supporting insert 44, serve to prevent leakage of fuel gas at the sides of conduit 19 from one passageway to the other. For this reason, the inner end portionof each of bars 56 and 57 preferably projects upwardly and inwardly of the oven in the manner shown by end portion 58 of bar 56, to conform to the upward and inward projection of preferred insert plate 55. Ohviously other supporting means could be employed in place of bars 56 and 57, for instance U-shaped rods having their tops affixed to the bottom surface of horizontal plate 50 and their bottoms slidably movable on the bottom of conduit 19.

As shown in Fig. 1, flow control insert 44 is in 'an operating position in gas supply conduit 19 with its upwardly projecting plate 55 intermediate inlet 23 for duct 20 for endmost flue 16 and inlet 24 for duct 21 for adjacent flue 17 and its downwardly projecting orifice plate 54 intermediate fuel gas inlet 30 and duct inlet 23 for endmost flue '16. Consequently, flow of fuel gas is decreased to flues 17 and 18 via or by way of lower passageway 52 by the throttling action of orifice 54 of plate 53 and concomitantly increased to endmost flue 16 via upper passageway 51. Hence endmost flue 16 is'heated to a greater extent than fiues 17 and 18 to compensate for loss of heat by radiation from flue 16. When insert 44 is retracted or withdrawn to an off position, the position shown by broken outline '60, orifice plate 53 is intermediate outer end 61 of supply conduit or gas gun 38 and gas inlet 30 and upwardly projecting plate 55 is intermediate duct inlet 23 for endmost flue 16 and fuel gas inlet 30 to permit normal flow of gas to all heating flues. Insert 44 is slidably movable in conduit 19 by means of rod 62 having notch 63 in one end portion for engaging the lip of orifice 54, which rod can be inserted through the orifices or openings 45 and 46 in thebattery sidewall and gas gun respectively. However, other suitable means such as a wire having a hook at one end can be used in place of the rod for moving insert 44.

While heat loss by radiation is generally greatest from endmost flue 16, it also tends to occur to some extent from second and third heating fines 17 and 18 from the end of the heating wall. Hence it may be desired at times to increase flow of fuel gas to either or both of the second or third heating fines 17 and 18 from the end in addition to endmost flue 16. If such is the case, insert 44 would preferably be pushed or moved a suflicient distance inwardly within supply conduit 19 so that its upwardly projecting bafiie or plate 55 will be either intermediate duct inlet 24 and duct inlet 25 or duct inlet 25 and the inlet (not shown) for the duct for the next ,porting bars when moving the insert more inwardly.

Metallic .pipe -40 lining supply conduit 19 could also be lengthened to extend a greater distance inwardly in this event thereby enabling affixing the supporting bars to the conduit side walls by welding.

As disclosed in Fig. 2, fuel gas flow control inserts 69 and 64 are longitudinally movable within horizontal gas supply conduit 65a at preferably both the coke and pusher sides of the oven or battery, insert 69, being at the coke side and insert 64 at the pusher side. With inserts 69 and 64 each in an operative or on position as shown, flow of fuel gas is decreased to inner heating iflllCS 65, 66, 67 and 68 respectively by the throttling action of the orifice in each of orifice plates 70 and 71 of the inserts and increased to endmost fines 72 and 73 to heat the endmost lines to a greater extent than the inner dines to compensate for heat loss by radiation from the endmost fines. As shown in Fig. 3, horizontal fuel gas supply conduits 74, 75 and 76 are formed in the masonry beneath endmost vertical flue 77 of heating wall 78 and endmost and inner vertical fines 79 and 80 respectively of heating walls 81 and 81a respectively. Horizontal coking chambers are shown at 82 and 83. Upwardly projecting baffie or plate 84 of one fuel gas flow control insert is longitudinally movable in gas supply conduit 74, and downwardly projecting orifice plates 85 and 86 of two other gas flow control inserts are longitudinally movable in gas supply conduits 75 and 76 respectively. Vertical ducts 87 and 88 communicate gas supply con- .duits 74 and 75 respectively with heating fines 77 and 79. Regenerator chambers are shown at 59, 90, 91 and 92 and an air supply duct is shown at 93. v

In the embodiment of Figs. 8-10, fuel gas flow control insert 94 in horizontal fuel gas supply conduit 99 has a movable plate 95 which is imperforate, i.e. not formed with an orifice or opening. As shown, plate 95 has an arcuate periphery. Plate 95 which is preferably of metal, e.g. stainless steel, is movable into and out of a predetermined position wherein it extends'transversely to and obstructs portions of upper and lower passageways 96 and 97 respectively. As shown, plate 95 obstructs a major portion of lower passageway 97 and a smaller or minor portion of upper passageway 96. Plate 95 is affixed to rod 98 and also to plate 100, for instance by welding. Rod 98 extends through or intersects plates 95 and 100 and also extends through aligned positioning .orifices in plate 101 and orifice block 102. Rod 98 is not afiixed to orifice plate 101 and orifice block 102 but is movable inwardly and outwardly through their orifices, plate 100 and block 102 being afiixed to the lower surface of rectangular horizontal plate 103 such as by weldjng'. Plate 109, also imperforate and of parabolic shape extends upwardly and inwardly from horizontal plate .103 in similar manner to the upwardly extending insert .plate previously described. Ring-shaped or annular member 104 having notches or grooves 105 is afiixed at fits top portion to horizontal plate 103 for instance by ilwfelding. Spring 106, encompassing a portion of rod ;98, is aifixed at one end to washer 107 and free or nuattached at its opposite end, washer 107 encircling and ,being aifixed to rod 98.

When desired to move or turn plate 95 to a desired J01 different position, rod 98 (having plate 95 attached thereto) is pulled outwardly a small distance against the action of spring 106 either by hand or with a rod or ,wire having a hook at one end, with the aid of rod handle 108. Access is had to handle 108 within the conduit by j'moving swinging cover 110 downwardly from its broken outline position 111. Rod 98 is then rotated to move {plate 95 into the desired position, and the rod and plate then returned to the original or at rest position with the aid of spring 106 urging or pushing against washer 107. The position into which plate 95 is moved is governed or controlled by grooves 105 of annular member 104, as corners 112 of plate 100 (affixed to the movlable plate) must register or correspond with grooves 105 ;or annular member 104 to enable plate 95 to be re- ,Iturned to its at rest position. Plate 95 is prevented from being rotated. out of the desired position by the action of notches or grooves 105 of annular member 104 on the plate comers 112. If desired, the inner surface of such annular member could be formed with a relatively larger number of serrations or smaller grooves instead of the eight grooves shown, thereby enabling plate 95 to be moved to a considerably larger number of different positions. Gas flow control insert 94 is longitudinally slidable into and out of the aforementioned operating and off positions on the two elongated supporting bars affixed to opposite inner side walls of horizontal supply conduit 99, one bar being shown at 113. If desired, other supporting means such as the U-shaped rods could be used instead of the bars. Vertical duct 114 communicates the endmost flue (not shown) with supply conduit 99. Fuel gas is supplied through inlet for supply conduit 99.

The quantities of fuel gas flowing through upper and lower passageways 96 and 97 respectively can be varied or regulated by simply moving plate to close off or obstruct the cross-sectional areas of these passageways the desired extent. When plate 95 is moved to a predetermined position wherein it closes off a greater portion of the lower passageway than that of the upper passage, flow of fuel gas is decreased to the intermediate fines via lower passageway 97 and concomitantly increased to the end flue via upper passageway 96 to provide for heating of the end flue to a greater extent than the intermediate fines to compensate for radiation heat loss from the end flue.

Although certain preferred embodiments of the invention have been disclosed for purpose of illustration, it will be evident that various changes and modifications may be made herein without departing from the scope and spirit of the invention.

What is claimed is:

1. A modified gas-gun type coke oven adapted for flexibility in operation of long and short coking cycles comprising a horizontal coking chamber, a heating wall for said coking chamber arranged along a side thereof, said heating wall comprising a row of vertical fines, a unitary horizontal fuel gas supply conduit beneath the heating fines, said gas supply conduit having an outer section terminating adjacent the external surface of the oven masonry, vertical ducts communicating said unitary sup ply conduit with the heating flues, a fuel gas inlet in said outer section of said supply conduit spaced from the outer end of said outer section, a fuel gas flow control insert movable within said unitary supply conduit for controlling flow of fuel gas to said fines to permit coking operation for long and short cycles, said flow control insert comprising a substantially horizontal member of Width approximating that of the supply conduit extending across and dividing a portion of said supply conduit into upper and lower passageways each of substantial length, a baflie mounted at an outer end of the horizontal member, said baffle being adapted to project downwardly from said member outer end and extend transversely to and partially obstruct the lower passageway, another bafiie which is imperforatc projecting upwardly from an opposite inner end of said horizontal member and extending transversely to and obstructing the upper passageway, said gas flow control insert being arranged for longitudinal movement within the supply conduit between a first position wherein said outer bafile is intermediate the outer end of the outer section of the supply conduit and the fuel gas inlet and said upwardly projecting baffie is intermediate an inlet for the duct for the end flue and said fuel gas inlet to permit normal flow of fuel gas to all fines and a second position wherein said upwardly projecting inner bafile is intermediate the duct inletfor an end fine and an inlet for the duct for an adjacent intermediate fine and said outer baflie is intermediate the fuel gas inlet and an inlet for the duct for the end flue whereby flow of fuel gas is controlled to end and inner flues.

2. A modified gas-gun type coke oven adapted for flexibility in operation of long and short coking cycles comprising a horizontal coking chamber, a heating wall for said coking chamber arranged along a side thereof, said heating wall comprising a row of vertical flues, a unitary horizontal fuel gas supply conduit beneath the heating flues, said gas supply conduit having an outer section terminating adjacent the external surface of the oven masonry, vertical ducts communicating said unitary supply conduit with the heating flues, a fuel gas inlet in said outer section of said supply conduit spaced from an outer end of said outer section, a fuel gas flow control insert movable within said unitary supply conduit for controlling flow of fuel gas to said flues to permit coking operations for long and short cycles, said flow control insert comprising a substantially horizontal plate of width approximating that of the supply conduit extending across and dividing a portion of said supply conduit into upper and lower passageways each of substantial length, a non-rotatable baffle formed with an orifice projecting downwardly from an outer end of said horizontal plate, said orifice baffle extending transversely to and partially obstructing the lower passageway, the orifice of said orifice bafiie having a smaller cross-sectional area than that of the lower passageway for throttling flow of fuel gas to the inner flues, another baflle which is imperforate projecting upwardly from an opposite inner end of the horizontal plate, the last-mentioned baflle extending transversely to and obstructing and terminating the upper passageway, said flow control insert being arranged for longitudinal movement within the supply conduit between 'a first position wherein said downwardly projecting orifice bafile is intermediate the outer 'end of the outer section of the supply conduit and said fuel gas inlet and said upwardly projecting baffle is intermediate an inlet for the duct for the end flue and said fuel gas inlet to permit normal flow of fuel gas to all flues and a second position wherein said upwardly projecting baflle is intermediate the duct inlet for an end flue and an inlet for the duct for an adjacent inner flue and said downwardly projecting orifice baffie is intermediate the fuel gas inlet and the duct inlet for the end flue whereby flow of fuel gas is decreased to inner flues via the lower passageway and concomitantly increased to the end flue via the upper passageway to provide for heating of the end flue to a greater extent than the inner flues to compensate for loss of heat by radiation from the end flue.

3. A modified gas-gun type coke oven adapted for flexibility in operation of long and short coking cycles comprisin" a horizontal coking chamber, a heating wall for said coking chamber arranged along a side thereof, said heating wall comprising a row of vertical flues, a unitary horizontal fuel gas supply conduit beneath the vertical flues, said gas supply conduit having an outer metallic section terminating adjacent the external surface of the oven masonry, vertical ducts communicating said unitary supply conduit with the flues, a fuel gas inlet in the outer metallic section of said supply conduit closely spaced from an outer end thereof, a fuel gas flow control metal insert movable within said unitary supply conduit for controlling flow of fuel gas to said :flues, to permit coking operations for long and short cycles, said flow control insert comprising a horizontal elongated plate of width approximating that of said supply conduit extending across and dividing a portion of said supply conduit into upper and lower elongate passageways, a nonrotatable plate formed with an orifice projecting downwardly from an outer end of said horizontal plate and integral therewith, said orifice plate having an arcuate periphery and size similar to that of the lower passageway and extending transversely to and partially obstructing the lower passageway, the orifice of said orificeplate having a smaller cross-sectional area than that of the lower passageway for throttling flow of fuel gas to the intermediate flu es, another plate which is imperforate projecting upwardly from the opposite inner end of the horizontal plate and integral therewith, the last-mentioned plate extending transverselyto and obstructing and terminating the upper passageway, said flow control insert being arranged for longitudinal movement within the supply conduit between a first position wherein said downwardly projecting orifice plate is intermediate the outer end of the outer metallic section ,of the supply conduit and said fuel gas inlet and said upwardly pros jecting plate is intermediate an inlet for the duct for the end flue and saidrfuel gas inlet to permit normal flow of fuel gas to all flues and a secondrposition wherein said upwardly projecting plate is intermediate the duct inlet for the end flue and an inlet for the duct for an adjacent intermediate flue and'said downwardly projecting orifice plate is intermediate the fuel gas inlet and the duct inlet for the end flue whereby How of fuel gas is decreased to the intermediate flues via the lower passageway and concomitantly increased to the end flue via the upper passageway to provide for heating of the end flue to a greater extent than the intermediate fiues to compensate for loss of heat by radiation from the end flue.

4. A modified gas-gun type coke oven adapted for flexibility in operation of long and short coking cycles comprising a horizontal coking chamber, a heating wall for said coking chamber arranged along a side thereof, said heating wall comprising a row of vertical flues, a unitary horizontal fuel gas supply conduit beneath the vertical flues, said gas supply conduit having an outer metallic section terminating adjacent the external surface of the oven masonry, vertical ducts communicating said unitary supply conduit with the flues, a fuel gas inlet in the outer metallic section of said supply conduit closely spaced from an outer end thereof, a fuel gas flow control metal insert within said unitary supply conduit for controlling flow of fuel gas to said fiues to permit coking operations for long and short cycles, said insert comprising a horizontal elongated plate of Width approximating that of the supply conduit extending across and dividing a portion of said supply conduit into upper and lower elongate passageways, a non-rotatable plate formed with an orifice projecting downwardly from the outer end of said horizontal plate and integral therewith, said orifice plate having an arcuate periphery and size similar to that of the lower passageway and extending transversely to and partially obstructing the lower passageway, the orifice of said orifice plate having a smaller cross-sectional area than that of the lower passageway for throttling flow of fuel gas to the intermediate flues, another plate which is imperforate projecting upwardly and inwardly of the oven from the opposite inner end of said horizontal plate and integral therewith, the lastmentioned plate extending transversely to and obstructing and terminating the upper passageway, two elongated parallel bars eachaffixed lengthwise to an opposite inner sidewall of said supply conduit and each projecting inwardly therefrom, the horizontal plate of said fiow control insert being arranged for longitudinal sliding movement on top surfaces of said parallel bars within the supply conduit between a first position wherein said downwardly projecting orifice plate is intermediate the outer end of the outer metallic section of the supply conduit and said fuel gas inlet and said upwardly projecting plate is intermediate the duct inlet for the end flue and said fuel gas inlet to permit normal flow of fuel gas to all fines and a second position wherein said upwardly projecting plate is intermediate the duct inlet for the end flue and an inlet for the duct for an adjacent intermediate flue and said downwardly projecting orificeplatfe is intermediate the fuel gas inlet and the duct inlet for the end flue whereby flow of fuel gas is decreased to the 9 intermediate flues via the lower passageway and concomitantly increased to the end fiue via the upper passageway to provide for heating of the end flue to a greater extent than the intermediate flues to compensate for loss of heat by radiation from the end flue.

5. A modified gas-gun type coke oven adapted for flexibility in operation of long and short coking cycles comprising a horizontal coking chamber, a heating wall for said coking chamber arranged along a side thereof, said heating wall comprising a row of vertical flues, a unitary horizontal fuel gas supply conduit beneath the vertical flues, said gas supply conduit having an outer metallic section terminating adjacent the external surface of the oven masonry, vertical ducts communicating said unitary supply conduit with the flues, a fuel gas inlet in the outer metallic section of said supply conduit closely spaced from an outer end thereof, a fuel gas flow control metal insert within said unitary supply conduit for controlling flow of fuel gas to said flues to permit coking operations for long and short cycles, said flow control insert comprising a horizontal elongated plate of width approximating that of the supply conduit extending across and dividing a portion of said supply conduit into upper and lower elongate passageways, an imperforate plate mounted at an outer end of said horizontal plate, said plate being shaped and arranged for movement into and out of predetermined positions wherein it extends transversely to and obstructs portions of the upper and lower passageways to modify the relative cross-sectional areas of said passageways, another imperforate plate projecting upwardly from an opposite inner end thereof and integral therewith, the last-mentioned plate extending transversely to and obstructing and terminating the upper passageway, said flow control insert being arranged for longitudinal movement within the supply conduit between a first position wherein said movable plate is intermediate the outer end of the outer metallic section of the supply conduit and the fuel gas inlet and said upwardly projecting integral plate is intermediate the duct inlet for the end flue and said fuel gas inlet to permit normal flow of fuel gas to all flues and a second position wherein said upwardly projecting inner plate is intermediate the duct inlet for the end flue and an inlet for the duct for an adjacent intermediate flue and said movable outer plate is intermediate the fuel gas inlet and the duct inlet for the end flue whereby flow of fuel gas is decreased to the intermediate fiues via the lower passageway when the movable plate is in a predetermined position wherein it closes off a greater portion of the lower passageway than that of the upper passageway and concomitantly increased to the end fiue via the upper passageway to provide for heating of the end fiue to a greater extent than the intermediate flues to compensate for loss of heat by radiation from the end flue.

6. A modified gas-gun type coke oven battery adapted for flexibility in operation of long and short coking cycles comprising horizontal coking chambers and interposed 10 heating walls, each heating wall comprising a row of vertical flues, a unitary horizontal fuel gas supply conduit beneath the vertical flues of each heating wall, said gas supply conduit having an outer metallic section terminating adjacent the external surface of the oven masonry, vertical ducts communicating each unitary supply conduit with the flues of each heating wall, a fuel gas inlet in the outer metallic section of each supply conduit closely spaced from an outer end thereof, a fuel gas flow control metal insert within each unitary supply conduit for controlling flow of fuel gas to the flues to permit coking operations for long and short cycles, each flow control insert comprising a horizontal elongated plate of width approximately that of the supply conduit extending across and dividing a portion of the supply conduit into upper and lower elongate passageways, a non-rotatable plate formed with an orifice projecting downwardly from the outer end of said horizontal plate and integral therewith, said orifice plate having an arcuate periphery and size similar to that of the lower passageway and extending transversely to and partially obstructing the lower passageway, the orifice of said downwardly projecting plate having a smaller cross-sectional area than that of the lower passageway for throttling flow of fuel gas to the intermediate flues, another plate which is imperforate projecting upwardly and inwardly of the oven from the opposite inner end of said horizontal plate and integral therewith, the last-mentioned plate extending transversely to and obstructing and terminating the upper passageway, each flow control insert being arranged for longitudinal sliding movement within each supply conduit between a first position wherein said downwardly projecting orifice plate is intermediate the outer end of the outer metallic section of the supply conduit and the fuel gas inlet and said upwardly projecting plate is intermediate the duct inlet for the end flue and said fuel gas inlet to permit normal flow of fuel gas to all flues of each heating wall and a second position wherein said upwardly projecting plate is intermediate the duct inlet for an end flue and an inlet for the duct for an adjacent intermediate flue and the downwardly projecting orifice plate is intermediate the fuel gas inlet and the duct inlet for the end fiue whereby flow of fuel gas is decreased to the intermediate flues of each heating wall via the lower passageway and concomitantly increased to the end flue of each heating wall via the upper passageway to provide for heating of the end flue to a greater extent than the intermediate flues to compensate for loss of heat by radiation from the end flue.

References Cited in the file of this patent UNITED STATES PATENTS 915,660 Collin Mar. 16, 1909 1,011,933 Feicks Dec. 19, 1911 1,739,929 Underwood et al. Dec. 17, 1929 1,790,597 Schroder Jan. 27, 1931 2,378,387 Becker June 19, 1945 

1. A MEODIFIED GAS-GUM TYPE COKE OVEN ADAPTED FOR FLEXIBILITY IN OPERATION OF LONG AND SHORT COKING CYCLES COMPRISING A HORIZINTAL COKING CHAMBER, A HEATING WALL FOR SAID COKING CHAMBER ARRANGED ALONG A SIDE THEREOF, SAID HEATING WALL COMPRISING A ROW OF VERTICAL FLUES, A UNITARY HORIZONTAL FUEL GAS SUPPLY CONDUIT BENEATH THE HEATING DLUES, SAID GAS SUPPLY CONDUIT HAVING AN OUTER SECTION TERMINATING ADJACENT THE EXTERNAL SURFACE OF THE OVEN MASONRY, VERTICAL DUCTS COMMUNICATING SAID UNITARY SUPPLY CONDUIT WITH THE HEATING FLUES, A FLUE GAS INLET IN SAID OUTER SECTION OF SAID SUPPLY CONDUIT SPACED FROM THE OUTER END OF SAID OUTER SECTION, A FUEL GAS FLOW CONTROL INSERT MOVABLE WITHIN SAID UNITARY SUPPLY CONDUIT FOR CONTROLLING FLOW OF FUEL GAS TO SAID FLUES TO PERMIT COKING OPERATION FOR LONG AND SHORT CYCLES, SAID FLOW CONTROL INSERT COMPRISING A SUBSTANTIALLY HORIZONTAL MEMBER OF WIDTH APPROXIMATING THAT OF THE SUPPLY CONDUIT EXTENDING ACROSS AND DIVIDING A PORTION OF SAID SUPPLY CONDUIT INTO UPPER AND LOWER PASSAGEWAYS EACH OF SUBSTANTIAL LENGTH, A BAFFLE MOUNTED AT AN OUTER END OF THE HORIZONTAL MEMBER, SAID BAFFLE BEING ADAPTED TO PROJECT DOWNWARDLY FROM SAID MEMBER OUTER END AND EXTEND TRANSVERSELY TO AND PARTIALLY OBSTRUCT THE LOWER PASSAGEWAY, ANOTHER BAFFLE WHICH IS IMPERFORATE PROJECTING UPWARDLY FROM AN OPPOSITE INNER END OF SAID HORIZONTAL MEMBER AND EXTENDING TRANSVERSELY TO SAID OBSTRUCTIG THE UPPER PASSAGEWAY, SAID GAS FLOW CONTROL INSERT BEING ARRANGED FOR LOGITUDINAL MOVEMENT WITHIN THE SUPPLY CONDUIT BETWEEN A FIRST POSITION WHEREIN SAID OUTER BAFFLE IS INTERMEDIATE THE OUTER END OF THE OUTER SECTION OF THE SUPPLY CONDUIT AND THE FUEL GAS INLET AND SAID UPWARDLY PROJECTING BAFFLE INTERMEDIATE AN INLET FROM THE DUCT FOR THE END FLUE AND SAID FUEL GAS INLET TO PERMIT NORMAL FLOW OF FUEL GAS TO ALL FLUES AND A SECOND POSITION WHEREIN SAID UPWARDLY PROJECTING INNER BAFFLE IS INTERMEDIATE THE DUCT INLET FOR AN END FLUE AND AN INLET FOR THE DUCT FOR AN ADJACENT INTERMEDIATE FLUE AND SAID OUTER BAFFLE IS INTERMEDIATE THE FUEL GAS INLET AND AN INLET FOR THE DUCT FOR THE END FLUE WHEREBY FLOW OF FUEL GAS IS CONTROLLED TO END AND INNER FLUES. 